How long will Abilify (aripiprazole) take to start having effect?

Days to weeks. Don't give up too soon. Keep taking it and let your doctor know how things are going. Unless you are getting worse, keep current dose. Your doctor probably gave you next appointment around the time that you will be able to tell whether current dose should be reconsidered. Effects can be subtle at first. A diary might help you figure out how much better you are.